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Draft:Mary E. Endress, translated from Spanish (and with more citations added).

Draft:Marriage of the Sea ceremony (Pisa). Sources to add:
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= Translation/expansion in progress: Avisio (Italian) =

The Avisio (La Veisc, Laifserbach) is an 89.4 km Italian stream (a torrente), a left tributary of the Adige, which flows in Trentino.

It rises from Marmolada and runs through the Fassa Valley, the Fiemme Valley and the Cembra Valley before joining the Adige in Lavis, a small town 8 km north of Trento.

The Avisio's watershed covers 940 km². It powers four hydroelectric power plants with a total nominal power of 106.18 megawatts.

Etymology
The name "Avisio" first appears ca. 1050 ("supra fluvium qui vocatur Auis"), then in 1200 ("ponte Avisi"). It is likely derived from Gaulish abisijo, "watercourse", which in turn comes from the Proto-Indo-European root abì, "water". .

Source and route
The river rises on Marmolada, then crosses the Fassa Valley, Fiemme Valley, and the Cembra Valley.

Fassa Valley
The first stretch of the Avisio is in Val di Fassa (the Fassa Valley). It originates there at Passo Fedaia (elev. 2054 m) as an outflow of Lake Fedaia, formed by the melting waters of the Marmolada Glacier. It flows immediately into the Fedaia reservoir, which diverts part of the water into the Cordevole basin for hydroelectric use.

The stream flows quickly and steeply down to the village of Penia, where it joins its first tributary, the ruf de Contrin from the Contrin Valley. After Penia, the valley widens suddenly into a wide southward curve, whose shallower slope slows and widens the stream.

In Canazei it joins the ruf d'Antermont from the Sella group. In the Campitello di Fassa stretch its flow rate increases considerably thanks to the ruf de Duron, and subsequently with the inflows of the ruf de Dona, the ruf de Udai, and the ruf de Soal, all coming from the Rosengarden group. At Pozza di Fassa, the San Nicolò River also joins the watercourse, arriving from the San Nicolò Valley. After Soraga di Fassa the stream forms Lake Soraga behind the Pezzé dam. (A pipeline from the lake feeds the Predazzo hydroelectric power station). At Moena the San Pellegrino River and the Costalunga River, both from the Latemar, flow into the Avisio.

After Moena, the Avisio enters the Fiemme valley.

Fiemme Valley
In the Fiemme Valley, the stream flows roughly east-west trend. Here its watershed extends to its maximum width as it receives the copious contribution of numerous streams, especially from the left, from the Lagorai. The main left-side tributaries include, in upstream-to-downstream order:


 * the Travignolo, the main tributary of the Avisio, which originates from the Travignolo glacier (located in the Pala group) and runs through the Venegia valley. Its course is dammed downstream of Paneveggio, creating Lake Paneveggio, which conveys its waters into the Cismon basin and thence the Brenta River. It flows into the Avisio near Predazzo;
 * the Pozze downstream of Predazzo, famous for its waterfall;
 * the Sadole near Ziano di Fiemme;
 * the Cavelonte near Panchià;
 * the Lagorai, coming from Lake Lagorai, near Tesero;
 * the Val Moena, which forms a picturesque waterfall in the last stretch, near Cavalese;
 * the Cadino from Manghen Pass, near Castello-Molina di Fiemme.

The right-side tributaries are generally shorter and more irregular in character. They include the Valsorda stream at Forno, the Gardoné stream at Predazzo, the Valaverta stream in Ziano, the Bianco stream in Panchià, the Stava in Tesero (famous for the 1985 Val di Stava dam collapse), the Gambìs stream near Cavalese and the Predaia River in Molina di Fiemme. Downstream of Molina, the stream is impounded by the Stramentizzo dam, creating Lake Stramentizzo; part of the water is conveyed to the hydroelectric power plant at San Floriano di Egna (BZ) and then released into the Adige.

In the Fiemme Valley, the Avisio intially flows on permeable, calcareous dolomitic rocks, but gradually moves onto the Adige porphyritic platform, where the rocks are impermeable and siliceous. This changes its hydrology.

Cembra Valley
[...]